All you have to know about RPM

by Alexandre de Abreu

How can I figure out the installation time of my packages?

The following commands are useful when you just had problems with recent installed packages, they'll print a list os installed packages sorted by install time:

rpm -qa --queryformat '%{installtime} %{installtime:date} %{name}-%{version}\n' | sort -n | sed 's/^[0-9]*//'
Or
rpm -qa -last | tac

Thanks to Sandy Pond and Ramon Gutierrez.